Cylinder hone



ne@ 25, 192s.

E. A. HALL ET AL CYLINDER HONE Filed Maron 25,v 192s l D s v L. l.

Patented Dee. 25, 192s.

UNITI-:n STATES` ERNEST A. HALL AND GERALD J. LINDROTH,

1,696,471' OFFICE.

OF TOLEDO, OHIO, ASSIGNORS TO THEv 'PATENT Hann MANUFACTUBING' counmnor Towne, onto, A consonancia or omo.

` QYLINDER HoNE.-

application and Haren as, 192e.' 'semi nu. 97,240.

This invention relates to devices for truing the internal walls of cylinders by a rotary grinding or abrading action, and is particularly intended for use bot-h in connection with new engine cylinders to give them a perfect initial bore and also in connection with used engine cylinders to eliminate tapers and ovals therein resulting from use. y

ln' the use of a tool of this character, for instance in ta ered cylinders. to remove the taper, a consi erable outward pressure of the abrading members against the cylinder Wall, usually as muchas 150 pounds, is required in order to effect any cutting or abrading action. To obtain proper results, the abrading members must be parallel with the cylinder axis, and are, therefore, out of parallel with the tapered cylinder wall to be trued. rlhe abrading pressure of the hones or abrading members on the cylinder wall is, therefore, exerted at the end ot the members which rst contact with the cylinder Wall, thus tending to spring the members out oftrue parallelism and preventing accurate work being accomplishe y A rlhe object of this invention is the provision of a device -ofthe character described,

' the construction of which is such as to positively prevent any springing of the abrading members or their carriers out of parallellsmwith the axis of the cylinden being treated` .and which permits a cylinder to be trued with a fine Vdegree of accuracy andk with an error-of not more. than one thousandth ci? an inch out of true. y,

- ./t turtherlobject o the invention-is to provide a device of this character which is capable of having its abrading members set at any desired adjustment-and tounyieldingly maintain such adjustment, and also of hav-v ing such members set for a ypredetermined limit of inward of collapsing movements and to have a yielding outward abrading pressure applied thereto, depending' on the nature and particular requirements of the work to be performed.

The invention is i'ully' described in the.

following specification, and while it is capable of embodiment in numerous forms, three only of such embodiments are illustrated in the accompanying drawings, in'which,'

l `igure 1 is a side elevation` of a tool embodying the invention with the s ring tension relieved and witha part breien away. Fig. 2 is a central longitudinal section of the 'of the bosses, these arms being 'the tool body, which has-a central bore or opening 2 longitudinally therethrough and is provided in eq'uidistantly spaced relation around its outer side with longitudinally apertured bearing bosses 3 extending lengthwise of the body with their aperturesparallel to the body axis. ln the present instance, the body l is substantially rectangular inr cross-section and has at each corner an extension forming a bearing boss 3. Each boss 3 has a. lpivot pin d projecting through its aperture, anda carrier 5 for a stone or abrading member 6 is carried by each pin tor transverse swinging movements relative to the body. ln the resent instance, the pins 4 proJect beyond 0th ends of the respective bearing bosses and the carriers ii have arms which engage the pins at the ends disposed at the ends oit thc carriers. '.lihe abradine meinbers 6 seat in channelled portions of tile car riers and are secured therein by set screws 7, as will be understood in the art.

' The body 1 is provided at its inner end with a thrust head 8, which is centrally apertured in axial alignment with the aperture 2 through the body, and, in the presentinstance, is secured to the body by the pivot pins 4, which thread therein.' 'Ehe pins t are also preferably tixed in the bearing bosses ot the body by pins 9 (Fig. 1), or din any other suitable manner, and the thrust head 8 is spaced from the inner end ot the body i l a distanceequal to the width oit the ren spective hinge arms of the carriers 5.

shaft 10 is feathered in the bore 2 et' the body l to permit it to have axial movements relative thereto and to ycause the hedy to rotate therewith. rllie shaft 10 at each end otl the body 1, and within the, limits of the respective ends of the carriers '5, is provided with a cone 1l, the outer one of which is removably carried by the shaft to permit its removal preparatory to `iremoving the llt) shaft from or inserting it into the body 1.

The removable cone, in the present instance, is threaded on the lower extended end portion of the shaft and is locked in shouldered end thereof, is provided with a tapered boss or projectionv 13 which opposes and is complemental to the tapered surface of the adjacent cone 11,.so that the inward swinging movements o the carriers relative to the body are stopped by the cones, and axial movements of the shaft and its cones will permit either a further inward movement of the carriers or will cause positive uniform outward movements thereof, depending on the direction 'of movement of the cones. Upon an upward or inward movement ot the outer cone 11, relative to the body 1, it enters a complemental recess 14 provided therefor in the lower end of'the body.

The shaft 10 extends outwardly through the central aperture inthe thrust head 8 and is provided at its outer end in suitable spaced relation to the thrust head with means for attaching it to a motor shaft, drill press spindle or other suitable driving means.

he attaching means, in the present instance, is shown as comprising a socket member 15.

Threaded on the shaft 10 between the thrusthead 8 and attaching means 15 is a hand nut 16 having a stop s eeve 17 project-v ing from one side thereot toward the thrust head 8 and adapted to have thrustcontact at its free end with said head when the nut 16 is turned down for such purpose. When the stop sleeve 17.is turned down with/ its lower end in engagement with the thrust head,8, it will be apparent that the shaft 10 will be drawn upward relative to the body 1, thereby causing the cones 11 to be set in any desired position of adjustment with respect to the engaging portions 13 of the carriers 5. This provides an unyielding set adjustment ,for the carriers, so that when operating Within a cylinder the Ydevicewill -not grind the cylinder wall toa greater against accidental turning tion. A set screw 19 may diameter than that for which ,the stones are set inasmuch as there is no provision iny this casev for exerting a yielding outward pressure on the carriers to continue the grinding action beyond the-point for which thecones are set.

A lockv nut 18 is provided on the haft atthe outer side of the nut 16 to cooperate therewith to lock it from aset posibe used to more securely lock the nuts 16 and 18 together.

' In order to provide thetools with means for effecting a continued.- outward yielding movement of" the carriers during an operation of the tool, where such action is desired, an adjusting nut 20is threaded on the stop sleeve 17 and a coiled compression spring 21 is interposed between it and the thrust head 8. It is evident that by turning the stop sleeve 17 back from engagement with the thrust head 18, and turning the nut 2() ldown to tension the spring 21, a yielding pull is exerted on the shaft l() relative to the holder 1 to cause the cones 11 to exert a yielding outward pressure on the hone carriers from a contracted position permitted by the spring 21. In other words, if the abrading portion of the tool is inserted in a cylinder and the nut 20- then screwed down to compress the spring 2l' and cause an outward grinding pressure of 'the abradin members against the cylinder wall, the grinding action ot' the tool when rotated will cont-inne until a predetermined amount of stock has'been removed. On the other hand, if it is desired to take oli only a very small predetermined portion of the cylinder surface, lthe spring pressure is relieved and the stop sleeve 17 is turned down to effect apositive setting of the cones 11 for the extent of grinding desired.

In practice it is desirable when first truing a cylinder to apply the lspring expanding actionto the abrading members so that. the'grinding will continue until a predetermined initial portionof the stock has been removed. When the cylinder has been `ground in this manner to substantially the diameter desired, the spring tension 1s relieved and the stop sleeve 17 turned down to give a positive set adjustment to the abradin vmembers so as to surface and accurate y true the cylinder after the yielding grinding action.

Another feature of this tool which makes it exceedingly accurate in action, consists in the solid bearing provided at both ends of each of the abrading members by the provision of the cones 11- and complemental coacting portions of the carriers at such points. With this arrangement combined with the rigid spacing of the cones and the facing thereof in the same direction, any inward pressure on the abrading members at one end tending to effect a longitudinal movement of the engaged cone, no matter how slight, will be communicated through the shaft to .the other cone so that it wlll have the same movement, thereby preventin any. inward springing movement of one en of the abrading members relative to the other. This is a feature which is extremely important'in order to maintain a true par-A allelism at all times of the abarding members and to accomplish accurate work.

In the modification shown in 5 the positive set feature is omitted and t e construction is otherwise changedV so as to enclose the spring within a housing part. In

this case a tubular member 25 is substituted for the thrust head 8 and has its bore of suficient size to receive the compression spring 26 between it and the cone carryin shaft, designated 27. An externally t readed sleeve '28 is threaded into the outer end of the member25 and bears against the outer end of the spring 26, while the Iinner end thrust of such s ring is exerted against the inner cone 29 o the shaft. It is apparent that an adjustmenty of the spring tension is eected by an inward or outward turning of the sleeve 28. ln this form the direction of taper of the cones is reversed over that previously described.

lln the i-nodiiication shown in Fig. v6 both the positive stop and yielding adjustment features are present, as described in connection' with the iirst form, the only difference being that the construction is such'that the direction of taper of the cones is reversed and the spring is disposed within yan enclosing part of the tool. ln lieu of the thrust head 8 of the first form described, the holder is provided at its inner end with a tubular extension sleeve 30 into which is threaded the stop sleeve 3l, the lower end of which may be turned into stop engagement with Y the upper large endof the ad'ustment cone 32. A spring tension adjusting sleeve 33 is threaded into the upper end of the stopl vsleeve 31 in bearing relation to the cone carrying shaft 34 and has thrust engagement with the upper end of a tension spring 35 that is enclosed within the stop sleeve 31 and has its lower end in thrust engagement with the adjacent cone 32.

We wish it understood that our invention is not limited to any s eciic arrangement, construction or form o the parts, as lit is capable of numerous moditcations and changes without departing from the spirit of the claims.

Havingthus described our invention, what we claim as new and desire to secure by Letters Patent is: 4 y

l. lin a tool of the class described, a rotatable body, an elongate abrading member carried by the body for outward movements relative to its axis, and drive means .movable lengthwise of the body and abrading member and having `a fixed portion receiving the inward thrust-of the abrading member and, when moved `in onev direction lengthwise of the abrading member, cans-- ing an outward positive adJustment thereof.

2. ln a tool of the class described, a body, a rotatable drive means for the body mounted for axial movements relative thereto and having fixedly spaced cam thrust portions, and transversel `movable abrading means carried by the ody in inward thrust contact with said cam portions whereby an axial movement in one directionff the drive means relative to the body effects a positive outward movement of the abradingmeans. 3. Ina tool of the class described, a body, a set of elongate abrading-member carriers carried by the body and transversely movable relative thereto, a drive shaft extending through the body for rotating it and permitting it to have axial movements rela-` tive to the shaft, and a set of spaced cones tapering in the same direction and tixedly carried'by the shaft, said cones having positive outward thrust engagement with the carriers in spaced relation longitudinally thereof, an outward adjustment of the carriers being effected by a movement -in one direction of the shaft relativo to the body.

4. In a holder. of the class cilescrilwd` a rotatable body, an elongate abrading-stone carrier parallel to the body axis and carried by they body for transverse movements relative (thereto, Corresponding tapered portions at each end of the carrier, a shai't engaging the body to drive the same and adapted to have axial movements relative thereto, said shaft having two longitudinally spaced fixed `cones of corresponding taper, engaging the respective tapei'so said carrier to provide a positive inward-thrust receiving means for the carrier ends and to effect a positive outward adjustment of the carrier when the shaft is movedin one direction relative to the body, and adjustable means coacting with the shaft and body to effect a. positive predetermined limiting of the movement ot' the shaft in one direction relative to the body.

5. ln a holder of the class described, a rotatable body, an elongate abrading-stone carrier parallel to the, body axis and carried by the body for transverse movements relative thereto, corresponding tapered portions at each end of the carrier, a shaft engaging the body to drive the same and adapted to have axial movements relative thereto, said shaft having two longitudinally spaced fixed cones of corresponding` taper engaging the respective ltapers or said carrier to provide a positive inward thrust receiving means for the carrier ends and to effect a ositive outward adjustment of thecarrier w ien the shaft is moved in one direction` relative to the body, adjustable means coacting with the shaft and body to eifect a positive predetermined limiting `of the movement of `the shaft in one direction relative to the body, and means operablev to act on the sha-ft and body to impart a predetermined yielding movement of one relative to the other and a consequent v tive thereto, a pair of corresponding cones carried in ixed'spa'ced relation by the shaft and facing in the same direction, elongate -abrading-stone carriers carried 'by the body action with said carriers, whereby any movein spaced relationaround the same and with their longitudinal 'axes disposed lengthwise of the shaft, each of said cones havmg coment of the shaft in one direction will impart like outward movements to both ends of the carriers, and adjustable tension means acting on the shaft and body for yieldingly opposing a movement of the shaft in one direction relative to the body.

7. In a tool'of the class described, a'. rotatable body, a shaft for driving said body and capable of limited axial movements relative thereto, a pair of corresponding cones carried in fixed spaced relation by the shaft and facing in the same direction, elongate abrading stone carriers carried by the body in spaced relation around the same and with their longitudinal axes disposed lengthwise of the shaft, each of said 'cones having coaction with said carriers whereby any move- `ment of the shaft in'one direction will impart like outward movements to both ends of the carriers, adjustable tension means u acting on the shaft and body for yieldingly opposing a movement of the shaft in one direction relative to the body, and adjustable means operable to positively limit to any predetermined extent the movement of the shaft in one direction relative to the body.

8. In a tool of the class described, a body, a plurality of abrading stone holding members carried by the body for swinging movements transversely thereof and each having longitudinally spaced sufaces, a shaft in driving connection with the body and adapted to have limited axial movements relative thereto, said shaft having tapered portions which are fixedly spaced axially thereof and facing in the same direction for coaction with said longitudinally spaced surfaces of the stone holding members, means coacting with the shaft and body for effecting a predetermined positive set adjustmentv of the shaft and body, and means cooperating with the shaft and body to effect a predetermined yielding adjustment of the shaft and body.

9. In a tool of the class described, a body, a plurality of abra'ding stone holding members carried -by the body for transverse swinving movements relative thereto, said members being disposed lengthwise of their swinging axes and of the body axis, a drive shaft projecting axially, throuh the body in drivingengagement therewit and'adapted to have limited axial movements relative thereto, said shaft having corresponding conical portions facing in lthe. same direction and in engagement with adjacent portions of each of said members, whereby'movement of the vshaft in one direction relative to the body will impart corresponding positive outward adjusting movementsto both ends of each of said members, and adjustable spring means operable to impart a yielding movement to the shaft relative to the bodyin a direction to force the said members outwardl from inwardly compressed sitons.

10. n a tool of the class describe a body, a plurality of abrading stone holding members carried by the body for transverse movements relative thereto, said members being disposed lengthwise of the body axis, a shaft projecting axially through the body in driving engagement therewith and adapted to have limited axial movement relative thereto, said shaft having corresponding conical portions facing in the same direction and in engagement with adjacent portions of each of said members, whereby movement of the shaft in one direction relative to the body will effect corresponding positive outward adjusting movements to both ends of cach of said members, and ad- `justable spring means capable of being in'- operative and being operable to impart a yielding movement to the shaft relative to the body in a direction to force the said members outwardly froml inwardly compressed positions, and adjustable positive stop means operable to limit the relative movements of the shaft and body in member collapsing direction and capable of use when the spring pressure means is inoperative.

1l. In a tool of the class described, a body, abrading-stone holding members carried by the body to permit .expanding and collaps. v

`whereby a movement of the shaft in one direction relative to the body will impart positive outward` movements to said members relative to the body, a stop sleeve threaded to one of said body and shaft and operable to provide an adjustable positive stop for themovement of the shaft in one direction relative tothe body, a coiled compressionspring adapted to have one end thrust .against the other of said shaft and bod than the one'to which said sto sleeve is threaded, and a member'threade tothe stop sleeve and adjustable to act on the spring to exert a yielding member expanding movement to' the shaft relative to the body or to relieve such action.

12. In a tool of the class described, a rotatable body,` abrading-stone vholders cartthe stone ,holders to impart outward transv verse movements to the holders when 4the shaft is'moved yin one direction relative tol the holder, and separate means interposed between the shaft and body, one being operable to ei'ect a positive set adjustment to the shaft relative to the body and the other being adjustable to exert a yieldingoutward stone holder actuating .movement to the shaft.

13. In a tool of the class described, a body, a plurality of abrading-stone holding members` carried by the body for transverse swinging movements relative thereto, a shaft projecting axially through the body in drivlng engagement therewith and adapted to have limited axial movements relative thereto, said shaft having aconical portion in engagement with each of said members whereby a movement of the shaft in one direction relative to the body will impart corresponding positive outwardl adjusting movements to the members, a stop sleeve threadedto one ofsaid body and shaft and operable to provide an adjustable positive stop for the movement of the shaft in one direction to the body, a coiled compression spring adapted to have one end thrust against the other of said shaft and body than the one to which said stop sleeve is threaded, and a member threaded to the stop sleeve and adjustable to act on the spring to exert a yieldlng member expanding movement to the shaft relative to the body, or to relieve such action. t

14. In a tool of .the class described, a body, a pluralit of abrading stone-holding members carrie by the body for transverse movements relative thereto, a drive-shaft projected axially into the body in driving engagement therewith and adapted to have limited axial movements relative thereto, said shaft and members havin coaeting portions .whereby a movement o the shaft in one direction relative to the body will impart corresponding positive outward adjusting movements to the members,` and means carried by the shaft and adjustable relative to the shaft and body to apply a limited positive unyielding expanding pressure to the stone-holding members.

15. In a tooll of the class described, a body, a plurality of abrading stone-holding members earned by the body for Atransverse movements lrelative thereto, a drive-shaft projected axially into the body in driving engagement therewith and adapted to have body for transverse movements relative thereto, means axially movable within the body and having coaction with the'stoneholder -to effect. an outward movement thereotwhen the means 1s moved 1nl one direction relativeto the body, and means in y connection with said first means disposed at one end of said body and operable to provide a positive stop to limit the relative movements ,of the body and said axially movable means in holder collapsing direc- 'tionl and also operable to provide' an adjustable spring means for yieldingly acting on said body and axially movable means to force the stone-holder outward.

17. In a tool of the class described, a

'and extending centrally therein and having cam coaction with the stone-holders whereby a relative movement of the body and member in one direction will impart outward movements in unison to the stone-holders, and means carried by said member at one end of the body and `.including a spring and a plurality of parts, which parts are adjustable relative to said member and to each other, one part being adjustable to cooperate with the holder and member to apply a limited positive unyielding expanding pressure to the stone-holders, and the other Vpart beingadjustable tocoact with the spring arrd with said body and member stone-holders.

In testimony whereof we have hereunto signed this specification. 

